
When you ask "What number is halfway between 0 and 90?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=0 and Y=90.

To find the number halfway between 0 and 90, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 0 and 90 into our formula, we get:
(0 + 90)/2 = 45
Thus, the number halfway between 0 and 90 is 45.
To check that our answer is correct, we subtract 0 from 45 and subtract 45 from 90 and compare the two numbers:
45 - 0 = 45
90 - 45 = 45
As you can see, the halfway number is 45 higher than 0 and 45 lower than 90. Therefore, our halfway between answer of 45 above is correct.
Halfway Between
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Halfway Between 0 and 91
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